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Connecting valves to manifolds

I saw the earlier thread on pre-built vs. diy manifolds. At this point, I'd just as soon buy pre-built if I could find such a thing (which I haven't). I intend to use the existing valves, which have threaded connections, and as much of the existing manifolds as I can salvage.

My question is: Is it recommmended to install adapters and unions so that the valves can be removed for service, or do most installers permanently connect--thread the adapter into the valve and glue it to the pipe?

Dura makes a "manifold tee" which i use. They have a 1" threaded male adapter for the valve and each tee glues into each other. They are made of schedule 40 PVC. Using these you still have the strong hold of the glue, and a permanant manifold

I used the dura manifolds all last summer they work great.....dura also has pre made ones.....like 3, 4 and 5 i think ....so you can throw 5-7 valves on one manifold and only have to connect a couple of elbows instead of putting a bunch of tees together.